NetSpell's suggestions for a misspelled word are generated using phonetic (sounds like) matching and ranked by a typographical (looks like) score. NetSpell supports multiple languages and the dictionaries are based on the OpenOffice Affix compression format.
NetSpell also supports user added words,...
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Crawler-Lib NHunspell is a spell check, hyphenation, word stemming and thesaurus library based on the Open Office spell check library Hunspell. NHunspell can use the vast amount of OpenOffice dictionaries. It is an alternative to NetSpell, GNU Aspell, ISpell, PSpell and Enchant. It wraps the native...
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EO.Web contains more than two dozen high quality server controls for ASP.NET, including Menu, TabStrip, TreeView, Grid, Dialog, HTML Editor, ToolBar, Spell Checker, Calendar, Date/Time Picker and much more. Several controls, such as ProgressBar, ToolBar and ScriptEvent are completely free. Support...
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File type checker that checks the file's magic numbers/identifying bytes. Useful for verifying uploaded files in web applications.
NuGet package of code originally written by https://github.com/mjolka and extended to allow for dependency injecting the known file types.

A simple client to use v2 of the Pwned Password service provided by Troy Hunt of https://haveibeenpwned.com. No passwords are sent to the service using v2, instead just the first 5 characters are used to adhere to a k-Anonymity model.